Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions

Kato, Shintaro; Ito, Shotaro; Nakahata, Shoko et al.

ChemSusChem, 2024, 17(22), e202401013

Number of Access:980（2025-08-28 21:09 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98296

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Title
Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions
Creator
CreatorName
Kato, Shintaro
CreatorName
Ito, Shotaro
CreatorName
Nakahata, Shoko
CreatorName
Kurihara, Ryo
NRID
1000000379314 1000000379314
researchmap permalink
rcsecharada rcsecharada
CreatorName
Harada, Takashi
NRID
1000040333447 1000040333447
ORCID
0000-0002-3313-2689 0000-0002-3313-2689
researchmap permalink
read0191166 read0191166
Scopus Author ID
7402706228 7402706228
CreatorName
Nakanishi, Shuji
NRID
1000050716016 1000050716016
ORCID
0000-0002-6018-9277 0000-0002-6018-9277
researchmap permalink
kamiya0908 kamiya0908
Scopus Author ID
24178005800 24178005800
CreatorName
Kamiya, Kazuhide
Subject
alkali metal cations
CO2 electrolysis
membrane electrode assembly electrolyzer
multi-carbon products
quantitative analysis
Description
Kato S., Ito S., Nakahata S., et al. Quantitative Analysis and Manipulation of Alkali Metal Cations at the Cathode Surface in Membrane Electrode Assembly Electrolyzers for CO₂ Reduction Reactions. ChemSusChem, (2024); https://doi.org/10.1002/cssc.202401013.
Abstract
The stable operation of the CO₂ reduction reaction (CO₂RR) in membrane electrode assembly (MEA) electrolyzers is known to be hindered by the accumulation of bicarbonate salt, which are derived from alkali metal cations in anolytes, on the cathode side. In this study, we conducted a quantitative evaluation of the correlation between the CO₂RR activity and the transported alkali metal cations in MEA electrolyzers. As a result, although the presence of transported alkali metal cations on the cathode surface significantly contributes to the generation of C₂₊ compounds, the rate of K⁺ ion transport did not match the selectivity of C₂₊, suggesting that a continuous supply of high amount of K⁺ to the cathode surface is not required for C₂₊ formation. Based on these findings, we achieved a faradaic efficiency (FE) and a partial current density for C₂₊ of 77 % and 230 mA cm⁻², respectively, even after switching the anode solution from 0.1 M KHCO₃ to a dilute K⁺ solution (<7 mM). These values were almost identical to those when 0.1 M KHCO₃ was continuously supplied. Based on this insight, we successfully improved the durability of the system against salt precipitation by intermittently supplying concentrated KHCO₃, compared with the continuous supply.
Publisher
John Wiley and Sons Inc
Source Title
ChemSusChem
Volume (Issue)
17(22)
Page
e202401013
Date of Issued
2024-08-07
Language
English
Handle URL
https://hdl.handle.net/11094/98296
PISSN
18645631
eISSN
1864564X
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1002/cssc.202401013
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article